gravity »

Why The Solar System Can Exist

Paul O'Flaherty 0

If gravity is so attractive, why doesn’t the earth just crash into the sun? Or the moon into the earth?

Minute Physics explains the answer: stable orbits.

Fun with Antibubbles

Paul O'Flaherty 0

Watch NASA astronaut Don Pettit create an antibubble, a bubble of water inside a bubble of air, inside a bubble of water. It’s bubble-ception in space.


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